Telephone-service apparatus



No. 750,770. PATENTED JAN. 26, 1904.

U. S. JACKSON. TELEPHONE SERVICE APPARATUS.

APPLICATION FILED APR. 22, 1903.

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APPLICATION IILED APR. 22, 1903.

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No. 750,770. PATENTED JAN. 26, 190.4. U. S- JACKSON. TELEPHONE SERVICE APPARATUS.

APPLICIATION FILED APR. 22, 1903.

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No. 750,770 U. s. JACKSON.

TELEPHONE SERVICE APPARATUS. A

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PATENT OFFICE.

URIAH S. JACKSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE SUPERIOR AUTOMATIC TELEPHONE COMPANY, OF BOSTON, MAS- SACHUSETTS, A CORPORATION OF MAINE.

TELEPHONE-SERVICE APPARATUS- SPEGIFICATION forming part of Letters Patent No. 750,770, dated January 26, 1904.

Application filed April 22,1903. Serial No. 153,854. (No model.)

To all whom it may concern.-

Be it known that I, URIAH S. J ACKSON, a citi- Zen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Telephone-Service Apparatus, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of telephone-service apparatus that involves the use of devices by which the person using the apparatus may call up any one on the system and in so doing cut out all of the others, so that there can be no interruption by a third party, and in which a step-by-step mechanism is used for calling the desired box; and it consists in combining with an apparatus of this class a dial mechanism having a pointer which is constructed to be moved so as to stand at a number on the fixed dial that will indicate the number of electrical contacts that will be made by the next movement of the step-by-step mechanism; this number indicating the box to be called, and a telephone-receiver having a circuit closer and opener attached.

The object is to simplify the working of this class of apparatus. This object I attain by the mechanism shown in the accompanying drawings, in which Figure 1 shows one of the telephone-boxes in elevation, its door being closed. Fig. 2 shows a box in elevation, the door being'open, and parts are represented as broken away for the purpose of showing other parts more clearly. Fig. 3 shows certain details in elevation. Fig. 4 is a vertical cross section taken on line 4 4: of Fig. 3. Figs. 5, 6, and 7 relate to the receiver. Fig. 8 is a diagrammatic view showing a manner of connecting the circuits of the novel features of this apparatus.

As my present invention relates to only a very small part of the apparatus required in this class of telephone service, it is not necessary to give a complete description of the entire mechanism, as that has already been fully explained in previous specifications and drawmgs.

Briefly, the parts to which my improvments closely relate may be explained as follows: The outside case or box of my instrument is indicated by A. A door B is hinged to the case and is shown as closed in Fig. 1 and as open in Fig. 2. There are as many of these boxes as there are users in the system. Each user has a number. In the present system there are fourteen of these boxes, each of which is indicated by a numeral on the dial D, Figs. 1 and 2. A pointer D moves on the dial and is made to indicate to the user that the desired or called box is in connection and may be communicated with.

The mechanism by which the calls are made in this class of apparatus may be described as follows: The lever L is rigidly connected to a shaft L and the said shaft L is so connected to the spring driving mechanism that by depressing the said lever L the driving mechanism is ready to act upon the notched makeand-break wheel O with a tendency to cause it when not locked to rotate in the direction of the arrow V. (See Figs. 2 and 8.) The number of the points O on the wheel O is equal to the numbers on the dial D and to the number of the boxes in the system. The pin O", extending from the under side of the wheel O serves to stop the said wheel by coming in contact with the end L of the lever L when the said lever is in its normal or resting position, as indicated in Fig. 2that is, the Wheel is stopped when it has made a complete rotation and has brought the pointer D to O on the dial. The lever L has upon it a pin L which is arranged to engage With the hook L on the bell-crank lever L L, pivoted at L This hook-lever L L is thrown into its looking position by a spring L and holds the operating or winding-up lever L in the position shown in Fig. 2, so that the Winding-up lever L cannot be used except when the cam-boss L is in the position shown in Fig. 2-that is, the boss L throws the end L of the lever up, and thus forces the hooked end L away from the pin L as shown, and thus unlocks the I Y said winding-up lever L. This unlocked posiceiver in his hand with one finger upon the 'tion is the position in all of the boxes when the pointer D is at 0. As the above-described parts are not new, they need not be more fully explained.

I will now proceed to describe the parts that I think are new. These parts relate exclusively to the users control of the service ap= paratus whilev he is talking, and with tele' phone-receiver in his hand with one finger of the same hand upon a push-button on said re ceiver he controls the entire system; but he controls it only so long as he holds the reattached push-button. Therefore the user when he has used the apparatus and lays the receiver down or takes his finger from the push-button allows the entire apparatus to assume its normal conditionthat is, all of the boxes will be ready for use, or, in other words, all of the levers L are unlocked and the lever of any box may be pushed down.

The users first act is to depress the lever L of his box. As soon as this is done it will start the whole mechanism of all the boxes,

which will cause the boss L to pass out from under the end L of the locking-levenand thus allow the hook L to swing into locking engagement with the pin L on the windingup lever L, thus looking it in all of the boxes except the one from which the call is made. The same movement will cause the pin (3* to pass out from under the electrode m and allow it to make an electrical contact with the electrode m Fig. 8, and thus close the circuit of the magnet M and cause the armature E to be drawn to the magnet. This action will cause the arm E, which swings on the pivot E to act through its pin E and draw up the link E ,which acting through the pin E causes the hook-lever E to swing on its pivot E and thus frees the arm E, which has the pawl E attached by the pin E the hook of the lever E* engaging with the extension of the pin E when the mechanism is in the position illustrated in Fig. 8; but when the mechanism is in the position shown in Fig. 3that is, when the magnet is energizedthen the hook of the lever E is not in engagement with the pin E of the pawl E Now the user by taking hold of the handle H, that is attached both to the pointer E and to the plate E, may turn the said plate and pointer to the desired position-that is, so that the pointer E will point to the number of the box to be called- 6, for instance. This action will carry the pawl E around to 6, and as the notches on the pawl-wheel C are the same in number and correspond to the contact-points C C on the wheel C to which the pawl-wheel C is rigidly attached, it is obvious that when the said wheel (J has rotated (in the direction of the arrow V) so as to make six contacts of its points C with the make-and-break electrode G, Fig. 2, then the pin E of the pawl E will have returned to the position shown in Fig. 8that is, sothat it will be stopped and held by the hook of the lever E* and box No. 6 will be put in electric communication with the 'box of the user. So long as the hook of I the lever E* holds the plate Eand the contactwheel C in this position the user may talk with No. 6. The arrangement is such that whenever the magnet M is not energized the hook of the lever E* will be in its locking position.

One of my improvements embodies a device connected to the receiver by which the user controls the magnet M and through it the locking hooked lever E. This device is fully illustrated in Figs. 5, 6, 7, and 8, and consists in a telephone-receiver in which two additional wires m and of are used,which are connected to the extra binding-posts T T of the receiver. It also consists in the circuit running from the magnet M through mm to the fixed electrode m in the receiver, Fig. 5, thence through the metallic spring m to wire m, thence to post T and through wire m to line WV to source of electricity, thence through line W, wire m to electrodes vii/ m and wire m back to magnet M.

The make-and-break device in the receiver consists of a spring-electrode m attached at one end to the boss T, Fig. 5, and acted upon at the other end by the push-button P. The parts are so arranged that when the push-button is not depressed by the user then the springelectrode 922 is in electrical contact with the fixed electrode m and the circuit through the magnet is completed, the magnet is energized, and the hook-lever E is drawn away from the pin E of the pawl E thus allowing the contact-wheel C to rotate; but when the pushbutton I is depressed then the circuit is opened and the magnet M is left unenergized, as indicated in Fig. 8, and the contact-wheel C is locked. When the user has given his message, he releases the push-button P, and thus closes the circuit through the magnet, which unhooks the lever E* and allows the wheel 0 to return to its normal or 0 point and readjust all of the mechanism of all the boxes to their normal position ready for future use.

I claim 1. In a telephone-service apparatus: a circuit make-and-break wheel and mechanism for operating the same; a pawl-wheel attached to the said circuit make-and-break wheel and having the same number of notches as there are make-and-break points on the said circuit make and break wheel; a pawl arm constructed to turn on the axis of the said makeand-break wheel and having a pawl adapted to engage with the notches of the said pawlwheel and also having a pointer to indicate on a numbered dial the position of the said pawl in relation to the points of the make-and-break wheel, whereby the number on the dial at which the said pointer stands will indicate the box to be called; the said numbered dial and an electrically-controlled mechanism by which the said arm and its pawl are held or released; substantially as and for the purpose set forth.

2. In a telephone-service apparatus: a circuit make-and-break wheel and mechanism for operating the same; a pawl-wheel attached to v the said circuit make-and-break wheel and having the same number of notches as there are make-and-break points on the said circuit make-and -break wheel; a pawl -arm constructed to turn on the axis of the said makeand-break wheel and having a pawl adapted to engage with the notches of the said pawlwheel and also having a pointer to indicate on a numbered dial the position of the said pawl in relation to the points of the make-and-break wheel, whereby the number on the dial at scribing witnesses, on this 17th day of April, 3

URIAH S. JACKSON.

Witnesses:

FRANK G. PARKER, JOHN BUCKLER. 

